Weft detector



Dec. 30, 1930.

R. G. TURNER 1,786,683

WEF'L1 DETECTOR Filed June- 27. 1929 -2 Sheets-Shea! l Dec. 30, 1930.

R. G. TURNER WEFT DETECTOR Filed Jline 27. 1929 2 Sheets-Shad 2 j W W F f /7 WOP/V945 PatentedA Dec. 3Q,V 1930 meats@ i are;

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MASSACHUSETTS MASSACHUSETTS', A CORPORATION 0Fr WEET EETECTOR Appiicvation filed Junefaaiaze. yseriai No. 374,124.

This invention relates to improvements of Weit detectors of the side slipping type ior looms and itv is the general object of the inventiony to provide a detector which willA not slip to Agive premature indication of weft if y the shuttle be improperly placed.

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rihe yarn engaging finger orarni of a weft detector is usually so placed asto be received by a slot in the binder of the lay as the latter moves forwardly. There is also a slot in the shuttlethroughu vwhich the.' detector finger moves when the shuttle is properly placed.

If the shuttle has rebounded, however, theV detector finger may engage the solid Wallof` the shuttle and slide along the same to give improper indication. Itis an important object of my present invention to provide a guard operative to engage the shuttle when improperly boxed and prevent side slipping of the detector.

-lQVett' detectors of the side slip type are usually so mounted as to move aroun'dya relatively fixed pivot when giving indication of weft exhaustion. The oiset of the yarn detecting surface relativelywto. the pivot must'v Y exceed a certain critical angle before side slipping movement can take place on a bare bobbin. Itis a further object of my present invention to provide la weft detector having n the usual yarn engaging surface placed so that it can slide at `exhaustion of weft together with an auxiliary surta-ce placed with I respectto the pivot so asto prevent angular movement of the detector eventhough the auxiliary surface or guard be in contact with a 'smooth surface, such'as the side wall of a shuttle. y

With" these and other objects inview which willappear as the description proceeds, my invention resides inthe combination and ar rangement of parts hereinafterdescribed and set forth'infthe claims. i Y

In the accompanying kdrawings whereina convenient embodiment of my inventionfis Set forth,

Fig.y l is a top plan viewiof an endy of the lay with parts removed showing my im-k proved or'in of detector in engagement with a full supply of wet,1 f o Fig. k2 is a view similar to a portion of Fig.

l but withthe detector in engagement with l asolid portion of the shuttle, Y

- 3 is a view Vsimilar to Fig. 2 but showing the auxiliarydetector or guard in engagement with the rings of the bobbin,

Fig. 4 section on line tof Fig. 1,

Fig. 5 is a view similar to Fig. 4 but showing` the relation of a detectorwith respect lto a substantially empty bobbin,

Fig. 6 isa section on line 6 6 of F ig. 2,

Figi isa perspective view looking from n the front showing the guard,

Fig. 8 is a detailed. vertical section on line 8 5 of Fig, and Fig. 9 is an enlarged view looking in the direction oi" arrow 9, Fig. 1.

Referring particularly to Fig. 1, Ifhave shown the lay 10 having a box front' 11 and box back l2 kbetween 'which is located the shuttle S. The box front is provided with a slot 13 throughfwhich the detector to be described may extend. I have shown my invention adapted to a form of loom wherein the shuttles run on their sides so thattranslrelationship with respect to an actuating "floating lever 23. The latter is pivoted on a stu'd`24 carried by a vertically reciprocating block 25. `The controller has a forwardly bent end 26 and for thefpurposes of the presentinvention kit is suiiicient to state that when end v26 is to the right of the adjacent end of the actuator lever 23 as viewed in Fig. f 1 the loom .will continue to operate with the same supply of weft, but when the controller; end 26 is moved to the lettothe dotted line position indicated at 27 under the adjacent end of the lever 23 a change in the operation of the loom will be initiated.

A compression spring indicated at 28 in dotted lines in Fig.` l acts to move the desulting from the feeler.

tector arm or linger 2O rearwardly, and the later by engaging a pin 29 on the slide 18 will cause the latter also to move-rearwardly under normal conditions. The rear end of the finger 2O is notched as at 30 and may be made relatively thin as indicated in Fig. 9 at 31.

In operation when a suiiicient supply of weft is present the detector arm Ywill move forwardly against the actionof spring 28 and the linger or arm 2O will undergo snbstantially no angular movement relatively to slide 18. UnderI these conditionsthe controller 22 will remain at rest and there will be no change in the operation of the loom relVhen insnliicient weft is present, however, the teeth 30 will notI be held by the arm and will slide along the substantially denuded bobbin B because of the fact that the roughened 0r notched surface 8O is oifset in the direction of the length of the bobbin with respect to the axis sulicient lmovement on the part of the controller with respect to the actuator lever Q53. yThe matter thus far described of itself forms no part of my present invention, the floating lever 23 operating in a manner similar to that set forth in patent to Ilyon No. 1,030,748.

As previously stated there are times when the detector teeth 30 will engage asurface other than the bobbin, such for instance, as when the shuttle is improperly positioned. Under these conditions the detector teeth may engage'either the rings Ll0 of the bobbin B or the upright wall il of the shuttle. In such cases the detector would ordinarily move in a clockwise direction around the stud 1'9 and give an improper indication of weft exhaustion. In ord r to prevent this I provide a guard 50 shown particularly in Fig. 7. The guard is formed preferably of pressed sheet metal, having an open forwardly errtending` bea "ing 5l having top and bottom portions 52 and 53, respectively, between Vwhich is adapted to extend the arm 20. A'These portions of the bearing are connected together as at 5l so that said ybearing may be made `of a single piece of metal. The top 52 is provided with a pair of threaded openings 55 adapted to receive lscrews 56 as shown for instance in Fig. 3 for the purpose of clamping the bearing 5l against the arm 20.

Secured to the rear part of the bearing 51 isa vertical wall 57 from which rearwardly yextend upper and lower horizontal plates 58 and 59, -rcspecti yely. These 'plates are spaced apart a distance somewhat yless than the diameter of the yarn of a full bobbin and their rear edges may be corrugated or scalloped as at G0. The scalloped edges are placed :at a sufficient distance from the teeth 30 so that when the bobbin is full of weft the teeth will be out of contact with the yarn. The plates are spaced by a distance greater' han the bobbin diameter when bare so that. the teeth 30 will be permitted to engage the bobbin. The space 6l located between the top and bottom portions 52 and 53 of the bearing aligns with a corresponding opening G2 formed in the wall 57and shown particularly in F ig. 8. By this construction I am enabled to slip the guard or auxiliary de tector over the arm 2O without deforming the latter.

Referring particularly to Fig. 1 it will be noted that the left hand ends of the upper and lower plates 58 and 59 extend toward a line passing through the stud 19 normal to the surface being detected. The slight angle existing between this normal line and the line passing from the stud 19 to the left end of the plates 58and 59 will be so small as to prevent side slipping movement of thev detector should the said plates engage a smooth surface.

In operation when suiiicient weft is present and the shuttle is properly boxed the parts will assume the position shown in Fig. l and the rear scalloped edges 60 which are smooth yto prevent .abrasion vof the yarn will engage the weft of the full bobbin to prevent contact of the teeth '30 of the detector with the weft. Under these conditions there will be no tendency for the armQO to move along the bobbin even though the rear edges of said plates be smooth because of the fact that the angle of offset is too small. As previously suggested when the weft is substantially exhausted the teeth 80 will be permitted to engage the substantially denuded bobbin B as set forth in Fig. 5,*sliding along the bobbinto Vgive indication of exhaustion. In this case the plates are not in contact with the bobbin and the teeth 30, being suflicientlyoifset fromthe axis of the detect-or, `may slide along the depleted bobbin.

If the shuttle should be slightly lmisplaced as suggested in Fig. 3 with the butt Vof the bobbin opposite the detector the rings 40 will engage the scalloped edges GO to prevent side slipping movement of the detector. Thilo I have shown these edges 60 as being scalloped yet this is not deemed necessary in View of the small angle of offset previously referred to. Should the shuttle be more widely misplaced the plates 58 and 59 will be permitted to engage the wall il of the shuttle and indication under these conditions will be prevented as yis also the case described in :connection with Fig. 8.

F rom the foregoing it will be seen that I 'have provided a simple attachment for side vangle of offset aswil'l prevent side slipping of lie one over and the other under the second element.

8. In a side slipping Wett detecting mechanism to detect a mass of yarn the diameter of which decreases as exhaustion approaches,

` a pair of ivelt engaging elements one of Which engages a large diameter of Wett only to prevent engagement of the latter ey the other element, the other element to engage the weft only when the Wett diameter is too small to be engaged by the first element, the first element being incapable of moving along the Weit when in contact therewith and the secondelement acting in the usual manner to move lengthwise and in Contact with a depleted Wett supply to indicate weft exhaustion, the iirst element having spaced members which lie one over and the other under the second element, said members extending behind the second named element.

9. In a side slipping weft detecting mechanism to detect a mass of yarn the diameter of which decreases as exhaustion approaches, a pair of Wett engaging elements one of which engages a large diameter of weft only to prevent engagement of the latter by the other A element, the other element to engage the fett FTE only when the Weit diameter is too small t be engaged by the lirst element, the i'lrst element being incapable of moving along the weft when in contact therewith and the second element acting in the usual manner to move lengthwise and in contact with a depleted weft supply to indicate weft exhaustion, said first named element being capable or" assuming a plurality of positions relatively to the second member, being secured to the second element in each position. f

10. In a weft detecting mechanism to detect `a mass of weft which decreases in diameter as it approaches exhaustion, a detector member, a pivot therefor around Which the member swings, and a pair of wett engaging elements on the member, one element eli'ective to engage the Wert when the same is of relatively large diameter but being so related to the pivot as to be incapable of sliding along a large diameter of weft to effect indication, and the other elementetfective to engage the weft When of a relatively small diameter only and being so related to the pivot as to slide at weft exhaustion to give indication of weft depletion.

In testimony Whereotl I have hereunto affixed my signature.

RICHARD G. TURNER. 

